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79fa9765ca
We now use AK::Error and AK::ErrorOr<T> in both kernel and userspace! This was a slightly tedious refactoring that took a long time, so it's not unlikely that some bugs crept in. Nevertheless, it does pass basic functionality testing, and it's just real nice to finally see the same pattern in all contexts. :^)
47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/FileSystem/FIFO.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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ErrorOr<FlatPtr> Process::sys$pipe(int pipefd[2], int flags)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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REQUIRE_PROMISE(stdio);
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if (fds().open_count() + 2 > fds().max_open())
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return EMFILE;
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// Reject flags other than O_CLOEXEC, O_NONBLOCK
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if ((flags & (O_CLOEXEC | O_NONBLOCK)) != flags)
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return EINVAL;
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u32 fd_flags = (flags & O_CLOEXEC) ? FD_CLOEXEC : 0;
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auto fifo = TRY(FIFO::try_create(uid()));
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auto reader_fd_allocation = TRY(m_fds.allocate());
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auto writer_fd_allocation = TRY(m_fds.allocate());
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auto reader_description = TRY(fifo->open_direction(FIFO::Direction::Reader));
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auto writer_description = TRY(fifo->open_direction(FIFO::Direction::Writer));
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reader_description->set_readable(true);
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writer_description->set_writable(true);
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if (flags & O_NONBLOCK) {
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reader_description->set_blocking(false);
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writer_description->set_blocking(false);
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}
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m_fds[reader_fd_allocation.fd].set(move(reader_description), fd_flags);
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m_fds[writer_fd_allocation.fd].set(move(writer_description), fd_flags);
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TRY(copy_to_user(&pipefd[0], &reader_fd_allocation.fd));
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TRY(copy_to_user(&pipefd[1], &writer_fd_allocation.fd));
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return 0;
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}
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}
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